STM32：DS1307读取日期及时间数值为85不会变化，请教大牛

只看该作者 · 2020-1-31 11:36

各位对I2C协议比较懂得朋友帮忙看下时序，如果能解决的，有偿服务亦可，可联系我XYZTZ_COM（微信号）联系我，程序如下，使用的是STM32F103C8T6的PB6-SCL PB7-SDA；模拟，外接上拉10K电阻，程序如下：
#define DS1307_SDA_PORT       GPIOB
#define DS1307_SDA_IO          GPIO_Pin_7
#define DS1307_SDA_RCC RCC_APB2Periph_GPIOB

#define DS1307_SCLK_PORT       GPIOB
#define DS1307_SCLK_IO       GPIO_Pin_6
#define DS1307_SCLK_RCC RCC_APB2Periph_GPIOB

#define DS1307_SDA_ON          GPIO_SetBits(DS1307_SDA_PORT,DS1307_SDA_IO)
#define DS1307_SDA_OFF       GPIO_ResetBits(DS1307_SDA_PORT,DS1307_SDA_IO)

#define DS1307_SCLK_ON       GPIO_SetBits(DS1307_SCLK_PORT,DS1307_SCLK_IO)
#define DS1307_SCLK_OFF       GPIO_ResetBits(DS1307_SCLK_PORT,DS1307_SCLK_IO)

#define READ_DS1307_SDA       GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_7)

#define DS1307_SDA_IN()  {DS1307_SDA_PORT->CRL&=0X0FFFFFFF;DS1307_SDA_PORT->CRL|=(u32)8<<28;}
#define DS1307_SDA_OUT() {DS1307_SDA_PORT->CRL&=0X0FFFFFFF;DS1307_SDA_PORT->CRL |=(u32)3<<28;}

void DS1307_Pin_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;//OD
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_SetBits(GPIOB,GPIO_Pin_6|GPIO_Pin_7);  //PB6,PB7¸ß
}

void IC_START(void)
{
DS1307_SDA_OUT();
  DS1307_SDA_ON;
  DS1307_SCLK_ON ;
  delay_us(4);
  DS1307_SDA_OFF;
  delay_us(4);
  DS1307_SCLK_OFF;
}
void IC_STOP(void)
{
DS1307_SDA_OUT();
  DS1307_SCLK_OFF;
  DS1307_SDA_OFF;
  delay_us(4);
  DS1307_SCLK_ON;
  DS1307_SDA_ON;
  delay_us(4);
}

u8 I2C_wait_ack(void)
{
u8 ucerrtime=0;
DS1307_SDA_OUT();
delay_us(5);
DS1307_SDA_ON;
delay_us(5);
DS1307_SDA_IN();
DS1307_SCLK_ON;
delay_us(5);
while(READ_DS1307_SDA)
{
ucerrtime++;
if(ucerrtime>250)
{
IC_STOP();
return 1;
}
}
DS1307_SCLK_OFF;
return 0;
}

void I2C_Ack(void)
{
DS1307_SCLK_OFF;
DS1307_SDA_OUT();
delay_us(20);
DS1307_SDA_OFF;
delay_us(20);
DS1307_SCLK_ON;
delay_us(20);
DS1307_SCLK_OFF;
}

void I2C_NAck(void)
{

DS1307_SCLK_OFF;
  DS1307_SDA_OUT();
delay_us(20);
DS1307_SDA_ON;
delay_us(20);
DS1307_SCLK_ON;
delay_us(20);
DS1307_SCLK_OFF;
}

void I2C_write_byte(unsigned char dat)
{
  unsigned char i;
DS1307_SDA_OUT();
DS1307_SCLK_OFF;
  for (i=0;i<8;i++)
  {
//delay_us(10);
if((dat&0x80) >> 7) //ouyang
//if(dat&0x80)
{
   DS1307_SDA_ON;
}
else
{
   DS1307_SDA_OFF;
}
dat<<=1;
  delay_us(20);
DS1307_SCLK_ON;
  delay_us(20);
   DS1307_SCLK_OFF;
delay_us(20);
  }
//DS1307_SCLK_OFF;
  //delay_us(1);
}

unsigned char I2C_read_byte(void)
{
  unsigned char i,dat=0;
DS1307_SDA_IN();
  delay_us(4);
  for (i=0;i<7;i++)
  {
DS1307_SCLK_OFF;
delay_us(20);
DS1307_SCLK_ON;
delay_us(20);
dat <<= 1;
if(READ_DS1307_SDA)
{
   //dat |= 0x01;
dat++;
}
delay_us(3);
  }
//if(!aaa)
//{I2C_NAck();}
//else
//{I2C_Ack();}
return (dat);
}

unsigned char Write1307(unsigned char add, unsigned char dat)
{
  unsigned char temp;
  temp=dat/10;
  temp<<=4;
  temp=dat%10+temp;
  IC_START();
  I2C_write_byte(0xD0);
delay_us(10);
  I2C_wait_ack();
  I2C_write_byte(add);
delay_us(10);
  I2C_wait_ack();
  I2C_write_byte(temp);
delay_us(10);
  //I2C_send_ack(1);
  IC_STOP();
//delay_us(10);
  return (0);
}

unsigned char Read1307(unsigned char add)
{
  unsigned char temp,dat;
  IC_START();
  I2C_write_byte(0xD0);
delay_us(10);
I2C_wait_ack();
  I2C_write_byte(add);
delay_us(10);
I2C_wait_ack();
  IC_STOP();
  delay_us(10);
  IC_START();
  I2C_write_byte(0xD1);
delay_us(10);
I2C_wait_ack();
dat=I2C_read_byte();
delay_us(10);
  I2C_NAck(); //·ÇÓ¦´ð£»

  IC_STOP();
  temp=dat/16;
  dat=dat%16;
  dat=dat+temp*10;
  return (dat);
}

void Read_RTC(void)
{
  unsigned char i,*p;
  p=rtc_address;
  for(i=0;i<7;i++)
  {
read_rtc_code[i]=Read1307(*p);
p++;
  }
}

void Set_RTC(void)
{
  unsigned char i,*p;
  p=rtc_address;
  for(i=0;i<7;i++)
  {
Write1307(*p,set_rtc_code[i]);
p++;
  }
}

void refresh(void)
{
  Read_RTC();//刷新时钟
  second=read_rtc_code[0];
  minute=read_rtc_code[1];
  hour=read_rtc_code[2];
  week=read_rtc_code[3];
  date=read_rtc_code[4];
  month=read_rtc_code[5];
  year=read_rtc_code[6];
}